SEATTLE -- How water flows in cities affects salmon swimming far away. An event this week is exploring how urban centers can better treat their water to protect these iconic Northwest species.

Salmon in the City is an online presentation that will look at approaches to architecture that keeps water clean for aquatic species.

Anna Huttel, certification director for Salmon-Safe, the organization promoting best conservation practices hosting the event, said one of the options cities can use to treat stormwater is planters.

"Bio-retention offers that above-ground visibility to inspire folks," Huttel pointed out. "As well as the opportunity to use plants to help to treat pollutants in the stormwater, provide habitat through the vegetation and really just provide something that's beautiful to look at as well. "

The event begins at 5:30 p.m. Thursday with presenters including Huttel and Brook Muller, Dean of the College of Arts and Architecture at the University of North Carolina-Charlotte. She will speak about sustainable architectures and climate-adaptive urban landscapes.

Huttel stressed her organization focuses on salmon because they are like canaries in the coal mine for habitat health, but Salmon-Safe could just as easily be called "water safe" because practices that are good for salmon are good for other species as well.

"Thinking about how these principles can help downstream, even if you can't see a water body from a site that you are influencing, everything has a trickle-down effect, reaches a larger water body and touches another part of the ecosystem," Huttel outlined.

Huttel also noted salmon are imperiled, affecting another iconic species of the Northwest: orcas. The whales, which live off the West Coast, rely on salmon for their diet and have increasingly struggled to find the food they need to survive.

Coming into the new year, Columbia Riverkeeper is supporting efforts by the Cowlitz Tribe and Yakama Nation to restore salmon migration throughout the Lewis River. Fish passages would enable migration around dams and access to blocked habitats, essential for salmon and steelhead recovery in the culturally vital Lewis River basin.

Miles Johnson, legal director with Columbia Riverkeeper, said he's optimistic about a future of thriving fish and river wildlife.

"We're tentatively pretty excited," Johnson said. "We're going to see fish in parts of the Lewis River, which is a really important tributary of the lower Columbia. We're going to see fish in places that they haven't been in many, many years."

PacifiCorp recently agreed to a new schedule to install fish passage at two of its hydroelectric dams on the Lewis. Johnson said PacifiCorp broke a previous pledge to retrofit its dams to include fish passage, adding that Columbia Riverkeeper will continue to hold the company accountable for promises to tribes and the public.

Johnson said Columbia Riverkeeper will also be watching the project carefully to ensure PacifiCorp follows through, given what he described as its past focus on financial interests over legal obligations.

"These are really expensive projects to build, and PacifiCorp has demonstrated a history of putting its bottom line before its obligations, to the fish and people who use the river," he continued.

Johnson added although things are in motion, until the fish passage facilities are built in a way that's meaningful and going to work, they will continue to monitor the process and if necessary, try to hold PacifiCorp accountable.

He said science shows that reconnecting fish with existing, high-quality spawning habitat is the best way to recover the Lewis River's struggling populations of spring Chinook and coho salmon, steelhead and bull trout.

The Biden administration wants to get serious about restoring salmon populations to the Northwest.

A presidential memorandum directs federal agencies to assess how they can improve fish numbers in the Columbia River Basin.

Mitch Cutter, salmon and steelhead associate for the Idaho Conservation League, applauded the memo, saying other presidents have dodged the issue because it is tricky to address.

"What we're seeing that's very different about this administration is that they are ready to embrace that complexity and ready to get to a level of 'How do we solve this problem?'" Cutter explained. "We've been putting this off across multiple administrations for 30 years now. How do we move this issue forward?"

Cutter pointed out salmon and steelhead populations over the past few decades have been in severe decline in the Columbia River Basin, including on the Snake River stretching into Idaho.

Cutter added working with Indigenous tribes is also prominent in the presidential memo.

"We're seeing this administration treat tribal justice much more seriously than past administrations have," Cutter observed. "At least say the right things about how it is paying attention to what tribes want and is going to factor them in not just as stakeholders but as coequal partners."

Cutter argued breaching the four lower Snake River dams in southeast Washington is important, especially for Idaho fish. He added the Bonneville Power Administration is critical to this decision.

"Because Bonneville Power in large part controls these dams and the energy that is created from them, they are the key player," Cutter contended. "They are someone that we would like this administration to really take a close look at, in regard to how they're treating these fish."

The Biden Administration is considering the future of Pacific Northwest salmon and the effect of dams in the region.

The White House Council on Environmental Quality held listening sessions this spring and is now asking for public comments on dams in the Columbia River basin.

They're especially focused on four dams on the lower Snake River that have been major barriers to the dwindling salmon populations that migrate upstream to Idaho.

Mitch Cutter is the salmon and steelhead associate with the Idaho Conservation League.

"What we've seen so far in both the listening session and in the public comments," said Cutter, "is an overwhelming majority of people saying they want to breach the lower Snake River dams - because it's essential for salmon and steelhead, and because there's other ways of doing the things that the dams provide."

Supporters of keeping the dams say they provide essential energy, irrigation and barging functions. But Cutter noted that during listening sessions, more than three-quarters of commenters were in favor of breaching the dams.

The Council on Environmental Quality public comment period is open through August 31.

Cutter said there is interest in removing the dams from a variety of people in the Northwest.

"We're seeing people from across the region," said Cutter, "come out of the woodwork and say, 'This issue matters to me, even if it didn't two, three, five, ten years ago. We'd like to have this problem solved.'"

During this year's legislative session, Washington state lawmakers approved $7.5 million for planning to replace the dam's services. The four Snake River dams are in southeast Washington.